Molecular copper(II) complexes derived from phosphonoacetic acid: Crystal structures and magnetic behavior

The syntheses, structural characterization, and magnetic behavior of five new copper(II) complexes derived from phosphonoacetic acid, H2O 3PCH2CO2H, with the formulae [Cu{(py) 2C(OH)2}](HO3PCH2CO 2H)2 (1), [Cu2(HO3PCH 2CO2)2{(py)2C(OCH 3)OH}2] (2), [Cu2(HO3PCH 2CO2)2(bpy)2] (3), [Cu 4(O3PCH2CO2)2(5-dmbpy) 4(H2O)4](NO3)2 (4), and [Cu4(O3PCH2CO2)2(5-dmbpy) 4(H2O)4](ClO4)2 (5) are reported. [H2O3PCH2CO2H = phosphonoacetic acid, (py)2C(OH)2 = bis(2-pyridyl) methanediol, {(py)2C(OCH3)OH} = bis(2-pyridyl) methoxymethanol, bpy = 2,2′-dipyridyl, 5-dmbpy = 5,5′-dimethyl-2, 2′-dipyridyl, terpy = 2,2′:6′,2″-terpyridine]. Complex 1 is a mononuclear compound with hydrogenphosphonateacetic acid in its monoanionic form, complexes 2 and 3 are dinuclear compounds with hydrogenphosphonoacetate(2-) bridging ligands, and complexes 4 and 5 are tetranuclear compounds with phosphonoacetate(3-) bridging ligands. The magnetic properties of polynuclear complexes 2-5 are reported. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.This research was supported by the Spanish Ministerio de Educación y Ciencia (MEC) (grant number CTQ2012-30662) and the Generalitat de Catalunya (grant number 2009SGR1454).Peer Reviewe